Riveting tool



y 1944. P. VAN SITTERT ET AL v 2,350,002

RIVETINQ TOOL v Filed Dec. 11, 1941 INVENTORS PAUL VAN $777537 BYLLOY 6.31 5771 ATTORNEY Patented May 30, 1944 UNITED STATES: PATENT OFFICERIVETIN G TOOL Paul Van Sittert, 'Shaker Heights, and Lloyd G.

Sireth, East Cleveland, Ohio, assignors to The. Cleveland Pneumatic ToolCompany, Cleveland. Ohio. a corporation of Ohio Application Decemberll,1941, Serial No. 422,602

6 Claims; (Cl. 7848) This invention relates broadly to portable toolsfor performing work such as riveting stamping punching, shearing orpressing, but .morepartic-.

ularly to'improvement in portable fluid actuated riveters with whichpressure rather than impacts is applied on the rivet.

Such portable tools, often referred to as' rivet squeezers, arewell-known in the art.- They include'a motor housing having a yokesecured to its front end and carrying a riveting die adapted tocooperate with a riveting plunger operated by the motor. In suchcases-the dieand plunger are ject laterally furtherfrom the' center axisof the tool, resulting in a cumbersome andunbalanced' front endincapable of reaching. rivets located in' confined places.

In anefiort to overcome this difiicultypthe standard type was-modifiedtoinclude a pair of pivotally mounted jaws each carrying a rivet .dier'movable within an are generally having its cen.-,

ter on the center axis of the tool. Thissecond type of tool, generallyreferred to as.-allegator type, while enabling the reaching ofvrivets'located further away from the edge of-the.work,--offers seriousdisadvantagesresulting fromxthe pivotal movement of thecooperatingjawsand dies; The rivet squeezed between these dies will often have itshead ofiset relative to thecenter axis ofthe- Y rivet... In other words,the pressureapplied on therivet instead of being an axial pressure asthat obtained with a standard tool, actually is exerted in obliquedirection relative to the-center axis of the rivet, causingthe head ofthe rivet to be lopsided.

It is therefore an object of this invention. to

produce an improved rivet squeezer offering the advantages of theallegator type of riveters but equipped with parallelly movable jawsenabling.

axial pressure to. be applied on'the rivets.

Another object of this invention is to produce a rivet squeezer equippedwith parallelly movable jaws located obliquely withrespect to the handleof the tool, thereby resulting in a compact well balanced front. endenabling the squeezing of rivets in places heretofore inaccessible .bythe allegator type of squeezer.

Another object of this invention is to produce a fluid actuated portablerivet squeezer or the like forming a simple and compact assembly whichis strong, durable and eificient.

In the drawing:

Fig. 1 is a side elevational view mostly in section with some of theparts cut away to show details of construction of a rivet squeezerembody-- ing the invention.

Fig. 2 is a view similar to Fig. l but showing some of the parts in adifferent position.

Fig. 3 is a longitudinal sectional view taken in a plane indicated byline 33 in Fig. 2.

Figs. 4, 5, 6 and 7 are cross sectional views taken in planes indicatedby lines 44, 5-5, 6-6 and 'Il respectively in Fig. 2.

Referring to the drawing, l0 and I6 represent the two parts of ahousing, the part 10 being a cylinder formed at one end with an integralboss l I having slidably therein a throttle valve I! for controllingadmission of the pressure fluid in the cylinder. The throttle valve ispreferably operated by a latch I3 fastened at one end of a rod M whichextends longitudinally through the wall of the cylinder and isterminated by an operating trigger l5. To the inner end of the cylinderI0 is secured a front housing part l6 which toward its front end issubstantially of diamond cross sec-"- tional shape as shown in Fig. 5,while the otherend'resembles more closely the cross sectional shape ofthe cylinder l0.

Slidable within the cylinder part Hi there is a piston 11 actuatedtoward the front housing part IE by means of pressure fluid such ascompressed air controlled by the throttle valve l2 and preferablyreturned by means of compression springs-- I8.

Rigidly secured to the part l6 and projecting lengthwise fromone endthereof, there are twoparallel plates 29. These platescare especiallyshape-cl to accommodatecomponent parts of the mechanism about. tobedescribed and have their outer ends united. together by. a solid blockform ing a Jaw-2!, which as shown is made an integral part of theplatesbut could be detachably secured hereto in any suitableway.Thestationary jaw 21 carries a detachableriveting die 22. Within thew.front housing 16 there are mounted between the. plates.?.&, two rollers23 each carried by cross pin- 2t supportedby the plates 20 aswellas theside walls of thefronthousing l6 as clearly shown in Fig. 6. Theserollers are adapted to be engaged by the straight upper side-.25 of adriving member or wedge 26. attached to.the piston I! for slidable imovement therewith. This wedge extends-be tween the plates 20 and hasits lower side 21 enmember 3| is also provided with a guide portion 34disposed at right angles from the jaw 32 and slidable between the plateswhere it has oneof its sides engaged by a roller mounted between theplates 20 on a cross pin 36 and its other side engaged by a roller 31also mounted between the plates 20 on a cross pin 38. In order to holdthe member 3| between the plates 20, the guide When the piston I! hasreached the end of its working stroke, pressure fiuid previouslyadmitted into the rear end of the cylinder part in is exhausted and thepiston and wedge are returned in their original position by means ofcompression springs i8. Concurrentl the jaw 32 is driven in its originalpositionby the spring pressed plunger 4| and acts on the lever 22 foralso causing the latter to assume the original :position shown in Fig.1.

Normally the opening of the jaw 32 relative to the jaw 2| is controlledby the latch 44 engaging the-stop 46. When desired, this latch may berotated in clockwise direction in Fig. 1 by compressing the spring 41,causing the inner end of the jaw to be lifted relative to the stop 46and enabling further opening Of the jaw 32 until the cross pin 4|]reaches the end of the slot 39, as

portion 34 is provided with an elongated slot 39 through which passesthe cross pin 40. Preferably the jaw 32 is constantly urged away fromthe -jaw 2| by a spring pressed plunger 4| carried by the guide portion34 and active against a cross pin 42 carried by the plates 20. The heelportion of the member 3| is engaged by the rounded end 43 of the lever29 through which the jaw 32 is moved toward the jaw 2| upon pivotalmovement of the lever resulting from the longitudinal movement of thewedge 26. For limiting the opening movement of the jaw 32 there isprovided a pivotally mounted latch 44 located on a cross pin 45 betweenthe plates 20 and having its inner end engageable with a stop 46provided on the guide portion 34, while the other end of the latchprojects upwardly from the plates 20 for manual operation, the latchbeing constantly urged into operative position by a compression spring47 inserted between the latch 44 and a block 48 secured to the fronthousing part |6 by a set screw 49. In order to prevent admission of dustor the like between the plates 20, there is provided therebetween withinthe upper end thereof a cover 50 held in position by cross pins 5|.

Operati0n.With the parts positioned as shown in Fig. 1, when thethrottle valve i2 is opened, motive fluid is admitted into the rear endof the cylinder HI and creates pressure on the piston for driving ittogether with the wedge 26 toward the left in Fig. 1, in which instancethe longitudinal movement of the wedge due to the engagement ofits'specially shaped side wall 2! with-the roller 28 will cause thepivotal movement of the lever 29 in clockwise direction in Fig. 1,resulting in the rounded end 43 0f the lever to push'the jaw 32 towardthe stationary jaw 2|. In this instance, it will be seen that during theinitial 'movement of the wedge 26, its relatively sharply inclinedportion 52 will cause a rapid pivotal movement of the lever 29 and theconsequential rapid movement of the jaw 32 toward the jaw 2|. Thisinitial movement is calculated to bring the riveting die 33 in contactwith the work or rivet 53 already engaged by the riveting die 22.Thereafter the roller 28 will be engaged wedge 26 for imparting a slowermovement of the jaw 32 toward the jaw 2| resulting in greater pressureof the riveting die 33 against the rivet 53 for upsetting the rivet.During this working stroke of the jaw 32, the guide portion 34 engagedby the rollers 35 and 31 is slidably guided therebetween to maintain thejaw parallel to the jaw 2| and consequently the riveting die 33 coaxialWith the die 22.

' by the relatively slow inclined portion 54 of the 1 "shown in Fig. 1.

It will be noted that the distance between the roller 28 and the crosspin 30 of the lever 29 is materially greater than that between therounded end 43 and the cross pin 30, thereby alfor'ding mechanicaladvantages or multiplication of power which is transmitted from thewedge26 to the jaw 32.

From the foregoing description it is apparent that by disposing the jawsso as to form an obtuse angle with the housing, that is, disposing.

them in a manner similar to that of an S wrench, it is possible toincrease the depth of the throat or opening between the jaws withoutnecessitating excessive lateral projection of the stationary jaw on oneside of the center axis of the tool. Through this novel disposition ofthe jaws, they extend about equally from opposite sides of the centeraxis of the'tool, resulting in a compact" and well balanced tool frontend.

Although the foregoing description is necessarily of a detailedcharacter, in order to completely set forth the invention, it is to beunderstood that the specific terminology is not intended to berestrictive or confining and it is to be further-understood that variousrearrangements of parts and modifications of structural detail may beresorted to without departing from the scope or spirit of the inventionas herein claimed.

We claim: 1. In a rivet squeezer, a housing, a power actuated pistonslidable in said housing, a pair of parallel plates extending lengthwiseof said housing through one end thereof, a stationary jaw carried bysaid plates, a second jaw carried between said plates for movementtoward said stationary jaw in parallel relation therewith, means on saidsecond jaw and disposed at right angles thereto to form slidable guidemeans between said plates for maintaining said second jaw in parallelrelation with aid stationary jaw, and means responsive to the slidablemovement of said piston for imparting slidable movement to said secondjaw.

2. In a rivet squeezer, a housing, a power actuated piston slidable insaid housing, a pair of parallel plates extending lengthwise of saidhousing through one end thereof, a stationary jaw carried by saidplates, a second jaw slidably fitted between said plates for slidablemovement toward said stationary jaw, guiding-means between said platesintegral with and disposed at right angles to said second jaw formaintaining it in parallel relation with said stationary jaw, and meansresponsive to the slidable movement of saidpistonv for impartingslidable movement to said second aw.

3. In a rivet squeezer, a housing, a pair of parallel plates extendinglengthwise from one end of said housing, a stationary jaw carried bysaid plates, a second jaw includin a guide portion slidable between saidplates for movement of the second jaw toward the stationary jaw inparallel relation therewith, and guiding means between said plates andon said stationary jaw for said guide portion maintaining said secondjaw parallel to said stationary jaw.

4. In a rivet squeezer, a housing, a pair of parallel plates extendinglengthwise from one end of said housing, a stationary jaw carried bysaid plates, a substantially flat element including a guide portionslidable between said plates, a jaw portion movable toward thestationary jaw in parallel relation therewith, and guiding means betweensaid plates for said guide portion maintaining said jaw portion parallelto said stationmy jaw.

5. In a rivet squeezer, a housing, a power actuated piston slidable insaid housing, a pair of parallel plates extending lengthwise of saidhousing through one end thereof, a stationary jaw carried by saidplates, a second jaw held between said plates for movement toward saidstationary jaw, said second jaw being substantially L-shaped andincluding a portion extending below said plates parallel with saidstationary jaw, the other portion of said second jaw extending at rightangles, to form guide means slidable between said plates for maintainingsaid second jaw in parallel relation with said stationary jaw, and meansresponsive to the slidable movement of said piston for impartingslidable movement to said second jaw.

6. In a rivet squeezer, a housing, a power actuated piston slidable insaid housing, a, pair of parallel plates extending lengthwise of saidhousin through one end thereof, a stationary jaw carried by said plates,a substantially L-shaped member held between said plates, said memberhaving a portion extending below said plates to form a second jawparallel to said stationary jaw, the other portion of said member beingat right angles to form guide means slidable between said plates formaintaining said second jaw in parallel relation with said stationaryjaw, a lever pivoted intermediate its ends between said plates, a rolleron one end of said lever, and the other end of said lever having a,rounded portion in engagement with the heel portion of said L-shapedmember, whereby actuation of said piston will efiect engagement thereofwith said roller to swing said lever on said pivot for impartingslidable movement to said second jaw.

PAUL VAN SI'I'IERT. LLOYD G. SPETH.

